Mounting for a tool holder



FIG. 1 is a side elevational view of a mounting for a tool holder showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a top plan view thereof. 

The ornamental design for the mounting for a tool holder, as shown. 